Work with numbers big and small to estimate and calulate various quantities in biological contexts.

Examine these estimates. Do they sound about right?

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

How would you go about estimating populations of dolphins?

How many generations would link an evolutionist to a very distant ancestor?

Work out the numerical values for these physical quantities.

Work with numbers big and small to estimate and calculate various quantities in biological contexts.

Work with numbers big and small to estimate and calculate various quantities in physical contexts.

Which units would you choose best to fit these situations?

When you change the units, do the numbers get bigger or smaller?

Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?

Practise your skills of proportional reasoning with this interactive haemocytometer.

Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?